Air purifier



FIG. 1 is a front perspective view of an air purifier, showing my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a left side view thereof.

A right side view is a mirror image of the left side view shown in FIG. 7.

The switch on the top in broken lines is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for an air purifier, as shown and described. 